Pneumatic door-lock.



J. G. MESSIGK.

PNEUMATIC DOOR LOCK.

APPLICATION FILED JAN. 23, 1912.

Patented Sept. 17,1912.

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JOHN C. MESSICK, OF SAN RAFAEL, CALIFORNIA, ASSIGNGR, BY DIRECT AND MESNE ASSIGNMENTS, OF ONE-THIRD T0 ROBERT G. JONES AND ONE-THIRD TO WILLIAM F. JONES, BOTH OF SAN RAFAEL, CALIFORNIA.

PNEUMATIC DOOR-LOCK.

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Specification of Letters Patent.

Patented Sept. 17,1912.

Application filed. January 23, 1912. Serial No. 672,839.

To all whom it may concern:

Be it known that 1, JOHN C. MnssIoK, a citizen of the United States, residing at San Rafael, in the county of Marin and State of California, have invented new and useful Improvements in Pneumatic Door-Locks, of which the following is a specification.

This invention relates to locks and more particularly to a pneumatic lock for car doors and other doors erected in such structures as may conveniently provide air under pressure to operate the apparatus.

The object of the present invention is to provide a simple, powerful and safe lock structure, and particularly to provide a pneumatic operable device in combination with a stationary structure such as a car and a movable door or member to be locked to the stationary member.

It is also an object of the present invention to provide a pneumatically operable lock involving details of construction for the control of air at suitable pressures to lock and unlock the device; means being provided whereby the air utilized in looking the bolt may be automatically closed.

The invention consists of the parts and the construction and combination of parts as hereinafter more fully described and claimed, having reference to the accompanyin drawings, in which- .Figure 1 is a horizontal section through a part of a car body and door with the lock in horizontal cross sect-ion. Fig. 2 is a detail, vertical sectional view through the lock structure, showing the parts in elevation in the open position. Fig. 3 is a detail view, showing the door in locked position. Fig. 4 is a horizontal section on line IV-IV, Fig. 2. Fig. 5 is a perspective view of the detent. Fig. 6 is a detail view of the valve- .closing device. Fig. 7 is a view of the key.

In the illustrated embodiment of my invention 2 represents a casing which may be of sheet metal, cast iron or other appropriate material, chambered to conform to and to provide the necessary spaces for the several movable members, one of which, as the bolt 3, is mounted in a chamber 4C at the upper end of the casing 2 and is adapted to swing about a stationary lug 5 in the casing. The bolt 3 may be flat and provided with a hook portion 6 which, when turned outwardly, will enter a keeper 7 attached to a door structure 8. The fiat bolt 3 is provided with a slot portion 9 adapted to permit the bolt to move transversely and swing about the fixed stud 5 and there is also provided in the bolt 3 an arcuate groove 10 of such proportions and design as will eifect the desired swinging and transverse sliding movement of the bolt when the latter is actuated through means of a crosspiece 11. This is shown as projecting through the slot 10 and carried in the sides of a yoke 12 secured to the upper end of a piston rod 13.

The casing 2 is shown as provided with a curved seat or abutment surface 1 1 with an arc struck approximately from the center of the transverse pin 5, and when the crosshead 11 moves vertically, it in combination with the arouate slot 10 causes the bolt 3 to rock from the position shown in Fig. 1 about the journal 5 until the lower end a of the bolt 3 is carried above a horizontal shelf 15, when further movement of the crosshead 11 acting upon the curved walls of the slot 10 shifts the bolt transversely across the ournal 5, thus locking the door 8.

The uppermost edge of the bolt 3 is provided with a recess 16 into which there is adapted to snap a detent 17 slidable in a pocket 18 and normally projected by an cxpansiblc spring 19 in said pocket. The lower end of the detent 17 is normally supported upon the upper arms 20 of a piston rod 21 to which is connected at the lower end a piston 22 movable in a cylinder 23 formed or made in the casing 2. The piston rod 21 is surrounded adjacent its connect-ion with the piston 22 by a- The piston rod 13 of the yoke 12, which.

carries the orosshead 11, is provided at its lower end with a piston 25 slidable in a cylinder 26 in the casing 2; the cylinder at its lower end communicating with the air chamber 27 into which air may be admitted from the pneumatic system of a car, when the lock is provided on such a car, through-means of a valve 28, provided with a stem 29, projecting outwardly toward the front edge of the casing 2, which is provided with an opening 30. V

' -When the door 8 ismoved into position to close the opening of the car, an aperture 31 in the car door registers with the opening 30 of the lock casing, so as to permit the insertion of a suitable key, as 32, whereby an operator may turn thevalve 28 to ad mit air into the chamber 27, and thence be:

neath the piston 25; the pressure of the air effecting an upward movement of the piston and the yoke 12 and the crosshead 11, which latter cooperating with the curved walls of the slot 10, first swings thebolt 3 about at which time the door will be effectually looked, as indicated in Fig. 3.

For the purpose of insuring the cutting off of, the air supply in the chamber 27 by the closing of the valve 28 in the event that the operator negligently omits'to close the valve, this operation will be automatically produced by the upward movement of the:

yoke 12, which is here shown as provided with a projection 12 adapted to encounter in its upward movement a link 33 guided insuitable bearings in the casing 2; the lower end of the link being appropriately connected to a lever 34 att-ached to the valve stem 29, the timing of the movement of the link 33 being such that as the uppermost limit of movement of the yoke 12 is reached,

at which time the bolt 3 will be practically thrown, the projection 12 on the yoke will encounter the link 33, and this will be moved sufliciently to automatically close the valve 28, thus cutting off the supply of air to the chamber 27 and cylinder 26.

The valve 28 is shown as controlling air pressure from the train pneumatic system and from which a pipe 35 may be continued and connected to the lock casing 2, and there is also connected to the lock casing 2 a pipe or other suitable connection 36 into which air may be admitted from any suitable source, when the car on which the lock is mounted is at a station, storage house, depot or other point where the car maybe loaded; After'the loading'of the car has been accomplished, the attendant may couple up the connection 36 to a convenient source of air supply and turn airtherethrough into the chamber 27 without moving the valve 28. There maybe provided between the connection 36 and the lock casing 2 a suitable valve 37 which normally is closed, so that when the valve 28 is open, air will not pass outwardly through the connection 36, since bot-h the connections 35 and 36 communicate into the common chamber 27; and

if a valve, as 37, were not provided, this escape of air would occur It will thus be seen that the swinging bolt 3 maybe closed at will by the application of 'air under pressure to the piston 25 and that this air may be applied through the train system by means of the valve 28 and the connection 35- with the train system; or air under pressure maybe provided to' actuate the piston 25 through'any other suitable source of supply by the connection 36.

lVhen the bolt 3 has been turned to horizontal position as in Fig. 3, and shifted so that its lower end a is carried across the shoulder 15, the detent 17 then automatically snaps into the recess 16, as this regis ters with the face of the detent, and thereafter the bolt 3 cannot be moved laterally until the detent 17 has been elevated so as to release thebolt by being carried out Of the slot 16. This releaseof-the bolt 3 from the control of'the detent-17 is accomplished by the application of air under suitable pressure to the lower end of the piston 22 and air is conducted'to the chamber 23 in whichthe piston 22 moves through suitable connection, as 38, into-which air: may

be admitted under the desired pressure, passing into a chamber 39 and thence into cylinder 23. The pressure of-airnecessary to move the piston 22 will, of course, be determined'by the downward thrust of the expansible spring 24 which normally forces the pistonv22 downwardly. When the desired pressure of air in chamber 29 has been reached, the piston 22 will-move upwardly carrying the-arms 21, which straddle the sides ofthe bolt 3, into contact with the downwardly projecting end of'the detent 17 and this will be forced upwardly out ofthe slot 16 compressing thespring 19. As soon as the detent 17 has been elevated to release the bolt 3, air flowing from the chamber 39 through a duct 40 enters the upper part of the chamber or cylinder 26 and forces down 'wardly the piston'25, which in turn moving the crosspiece 11, efiects first a transverse movement of the-bolt 3 in the lock casing 2 until the end a of the bolt rides off of the horizontal shoulder 15, when further downward movement of the crosspiece 11' swings i the bolt 3 about the fixed pivot 5 until the hook 6 of the bolt enters the chamber 4 of the lockfcasing, thus releasing the door.

Having thus described my invention, what I claim and desire to secure by Letters Patentis' V 1. In a lock, the combination with a chambered case, of a stationary pivot, a bolt mounted upon said pivot having a swinging and shifting'mov'ement relatively thereto, and a pneumatically operated member connected to said bolt. and adapted to swing and shift the same about the pivot. T

2. In a lock, the combination with a chambered case, of a stationary pivot, a bolt mounted upon said pivot having a swinging and shifting movement relatively thereto, a pneumatically operated member connected to said bolt and adapted to swing and shift the same about the pivot, and an automatically projected detent adapted to lock the bolt in shifted position.

3. In a lock, the combination with a chambered case, of a stationary pivot, a bolt mounted upon said pivot having a swinging and shifting movement relatively thereto, a pneumatically operated member connected to said bolt and adapted to swing and shift the same about the pivot, an automatically projected detent adapted to lock the bolt in shifted position, and pneumatically operative means adapted to retract said detentto release the bolt.

4. A pneumatic lock comprising a casing having a bolt capable of a swinging and shifting movement in the casing, a detent adapted to lock the bolt in shifted position, and pneumatically operable means for releasing the detent and shifting and swing ing the bolt. 7

shiftable in said casing and adapted to engage said keeper, a pneumatically operated member adapted to actuate said bolt, to engage the keeper, a detent for locking the bolt against shifting movement, and a pneumatically controlled element operative upon said detent.

In testimony whereof I have hereunto set my hand in the presence of tWo subscribing witnesses.

JOHN C. MESSICK.

Witnesses:

lV. F. JoNns, ROBERT G. Jones.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

